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(No Model.) 2 sheds-sheet 1.

A. J. MARQUAND. ELECTRICAL APPARATUS .FOR PREVENTING CORROSION 0F STEAMBOILERS.

110 393072. Patented Nov. 20, 1888.

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After/7e (No Model.) 2 Sheets-Sheet 2.

A. J.. MARQUAND. ELECTRICAL APPARATUS FOR PREVENTING CORROSION OF STEAMBOILERS.

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' NITED 'TAT E S;

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F CARDIFF, COUNTY OF GLAMORGAN,

ENGLAND.

grrrcrmcAt rrAnArus FOR PREVENTING CORROSION or STEAM-BOILERS.

srncmca'rron forming part Orr-eaters lPatent No. 39 ,012, dated November20, 1888.

Application filed January 17, 1988. Serial l lo. 26ll05'l. (No model.)Patented in England J one 10. 1887, No. 8,396.

To all wine m) it-may concern.-

" {Be't known that 1, AUGUs'rUsJoHN MAR- QUAND, a subject of theQueen ofGreat Britain, and residing at Bute Docks, Cardiff-in the county ofGlamorgan, England, engineer,

' have invented certain new and useful Improvements in ElectricalApparatus for Pre- Qventing Corrosion or Incrustation of Steam-Boilers'and other Similar Vessels and for Beniovingthe Incrustation whenOnce Formed,

(for which. I have obtained a patent in Great.

Britain, No. 8,396, hearing date June 10, 1887,)

of which the following is a specification.

My invention relates to an improved apparatus. for applying electricityto steam-boilers "and othersirnilarvessels for the purposes ofpreventing the formation; of incrustation, of

' removing it if already formed, and also of pre enting corrosionor'pitting of the internal surfaces; v

According-to my-invention the terminal bf an electric generatorcorresponding with the :zinc plate of a battery is electricallyconnected in any convenientway,and either directly or indirectly withthe shell, while the terminal correcorrosion of the inner surfaces ofthe shell will be increased, but that if the electricity be appliedaccording to my present invention 'cor- "rojs'ion-cannot and does nottake place; and,.as

it is generally believed that my method of applying an elwtrical currentto a boiler will not prevent i'ncrustatiou, I wish it to be'distinctlyunderstood that experience with my invention proves that iucrustationalready formed will be removed by it and itsreadherence effectuallyprevented.

Figure 1 is a detail sectional elevation illustrating the constructionof my improved appaiatus and its connection to the boiler-shell.

Fig. 2 is an elevation illustrating the applica-; tion elf my inventionto a marine boiler. Fig.

3 is a -diagramelevation illustrating the application of my invention toa land boiler. Fig. 4 is a detail.

Referring to Fig. 1, A is the shcllof the boiler, electrically connectedto the "negative pole of the battery. B is the conductor. This maybe ametal knob; but I prefer to use a perforated box of anyconveni'eu'tsection, which is filled with zinc. G is a ferrule screwedinto the boiler-shell, and D is an eificient insulation fixed inside theferrule and covering both ends of it by means of flanges or washers d d.E is a stud, to the end of which the conductor is securelyattached inany convenient way. [Ihe stud is passed through the ferrule, from whichboth it and the conductor are, however, insulated, as shown. A'nut, e,on the outer and screwed end of thestudis provided for the purpose offixing the conductor firmly in its position. F is the lead from thepositive pole of the battery coupled to theouter endof the stud E. G isa cap having a perforation, f, (through which the positive lead'istaken,) adapted to screw onto the ferrule for the purpose of protectingthose parts of the appara-' tus which it covers from being inj nred.

Referring to Fig. 2, His a marine boiler, and B the conductor,constructed as described above. I is the battery, carried byametalbracket, '13,- which is bolted to the boiler-shell. K is the leadfrom the negative pole of the battery to the metal plate 13, by whichthe boilershell is electrically connected to the said pole. L is thelead from the positive pole of the battery to the conductor B.

Fig.3 is a diagram illustrating the abovedescribed single-lead method ofapplying my invention to a land boiler. M is a pipe connected to theboiler, and m a clip suspended therefrom. The battery I is carried bythe clip m, and the negative pole is electrically connected'to the clipm and through it to the .boiler shell N by the lead n. L is the leadfrom the positive pole of the battery to the conductor B. O is anindicator introduced 9 5 into the circuit anywhere along the lead L. Ido not confine myself to any particular type-of indicator, but may useany that is ca- ;pable of indicating the existence of .an electricalcurrent as well as the direction in which 100 it is flowing.

A' modified and preferable method of con necting the negative pole ofthe battery with the boiler-shell is illustrated in Fig. 4, whichillustrates a battery adapted to be suspended from a pipe attached tothe boiler in the same 5 way as illustrated in Fig. 3, describedtherewith.

Instead of using a wire lead, n, from the teries, circuits, orconductors I make use of,

inasmuch as these may be varied according to convenience. If more thanone apparatus. be used onone boiler, they may be coupled up in 20series, if preferred.

I claim i 1. The combination of boiler-shell, metal bracket rivetedthereto, and a battery carried thereby,-the negative pole of which is 25electrically connected direct to said bracket,

the negative pole of the said battery being conan electrical conductorfixed to the boilershell, insulated therefrom, .and in electricalcontact with the water in the said boiler, and a wire leadfrom thepositive pole to the said conductor, as set forth. 0

2. Theaco'mbination of boilershell, metal clip adapted to supportabattery and to hem suspended from a pipe leading from the boiler,

nected direct to the said clip, an electrical conduetor fixed totheboiler-shelhinsulated therefrom, and in electricalcontact with thewater in the said boiler, and a wire lead from .the positive pole tosaid conductor, as set forth.

In witness whereof I have hereunto set my 40 hand this 21st day ofNovember, 1887.

AUGUSTUS JOHN MARQUAND.

\Vitnesses: v

RE'J. RIMELL,

6 Lanquhar Street, Cardelfi;

, HERBERT R. JONES,

36AM-an Street, Roatl Clerks to Messrs. Downing (fa H'dndcock,Solicitors, Oardifi".

